class AddColumnNumberOfclicks < ActiveRecord::Migration
  def self.up
    add_column :asin_infos, :number_ofclicks, :integer, :default => 0
    add_column :asin_infos, :number_ofclicks_rank, :integer
  end

  def self.down
    remove_column :asin_infos, :number_ofclicks
    remove_column :asin_infos, :number_ofclicks_rank
  end
end
